// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

using Xunit.Abstractions;
using Xunit.Sdk;

namespace Apache.Iggy.Tests.Utils;

public class PriorityOrderer : ITestCaseOrderer
{
    public IEnumerable<TTestCase> OrderTestCases<TTestCase>(IEnumerable<TTestCase> testCases)
        where TTestCase : ITestCase
    {
        var sortedMethods = new SortedDictionary<int, List<TTestCase>>();

        foreach (var testCase in testCases)
        {
            var priority = 0;

            foreach (var attr in testCase.TestMethod.Method.GetCustomAttributes(typeof(TestPriorityAttribute)
                         .AssemblyQualifiedName))
            {
                priority = attr.GetNamedArgument<int>("Priority");
            }

            GetOrCreate(sortedMethods, priority).Add(testCase);
        }

        foreach (List<TTestCase> list in sortedMethods.Keys.Select(priority => sortedMethods[priority]))
        {
            list.Sort((x, y) =>
                StringComparer.OrdinalIgnoreCase.Compare(x.TestMethod.Method.Name, y.TestMethod.Method.Name));
            foreach (var testCase in list)
            {
                yield return testCase;
            }
        }
    }

    private static TValue GetOrCreate<TKey, TValue>(IDictionary<TKey, TValue> dictionary, TKey key)
        where TValue : new()
    {
        TValue? result;

        if (dictionary.TryGetValue(key, out result))
        {
            return result;
        }

        result = new TValue();
        dictionary[key] = result;

        return result;
    }
}
